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From the 1917 Pio-Benedictine Code of Canon Law^[1]

Table of Contents

1. Canons 1.1. 1268 1.1.1. §1 1.1.2. §2 1.1.3. §3 1.1.4. §4 1.2. 1269 1.2.1. §1

1. Canons
1.1. 1268
1.1.1. §1
The most holy Eucharist cannot be kept continually, that is, habitually, except on only one altar of the church.
1.1.2. §2
It shall be kept in the most excellent and the most noble place of the church and therefore regularly on the major altar unless it seems that the veneration and cult of such a sacrament is more convenient and decent elsewhere, observing the prescriptions of liturgical law, which pertain to the final days of the great week.
1.1.3. §3
But in cathedral churches or in collegial or conventual ones in which choral functions are conducted at the main altar, lest ecclesiastical officials be impeded, it is opportune that the most holy Eucharist not regularly be kept at the major altar but in another chapel or altar.
1.1.4. §4
Let rectors of churches take care that the altar in which the most holy Sacrament is reserved be decorated above all the others so that by this appearance the faithful be moved to greater piety and devotion.
1.2. 1269
1.2.1. §1
The most Holy Eucharist must be preserved in an immovable tabernacle located in the center part of the altar.
§ 2 The tabernacle shall be well-constructed, closed on all sites, decently decorated according to the norm of liturgical law, empty of all foreign things, and thus carefully kept so that any sort of danger of sacrilege or profanation is excluded.
§ 3 If grave causes, approved by the local Ordinary, so persuade, it is not forbidden to preserve the most Holy Eucharist at nighttime outside the altar but on a corporal in a safe and decent place with due regard for the prescription of Canon 1271.
§ 4 The key of the tabernacle in which the most Holy Sacrament is preserved must be diligently kept, gravely burdening the conscience of the priest who has care of the church or oratory.
References

• ^ s.a. "Eucharisticuм Mysterium"
  
  (Emph. and org/formatting mine. Please see attached for more user-friendly version DZP)

§ 4 The key of the tabernacle in which the most Holy Sacrament is preserved must be diligently kept, gravely burdening the conscience of the priest who has care of the church or oratory.

Reading this reminds me of a situation where I was apparently the only person who knew where the pastor kept the Tabernacle key... After he left he must not have told the replacing priest where the key had been placed, so it was "lost" for an evening (or even a week?) until I informed the next priest of the storing location. 
That must've been alarming not knowing where it was.

Are tabernacles supposed to be in the center on altar?

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Remodeling of churches after Vat.II have used the excuse of "the [unclean] spirit of Vatican II" for moving the tabernacle off the altar and into a broom closet or whatever.
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They have said that since the altar is turned around, the celebrating priest doesn't feel right having his back to the the tabernacle, so therefore, it must be moved.
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Traditionally, all of the church architecture has been centered on the tabernacle as the focal point of all places inside the church. The symmetry of lines and designs has always been with the main focus on the center of the main altar, where the tabernacle is.
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After the Newmass was dragged in like something by the cat, next came all manner of accommodation, even major remodeling involving tearing out of confessionals and rearranging the pews.
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With the off-center fad of non-conformism to tradition, along came the fad of exiling Our Lord to whatever left-over space there was after much more important concerns were addressed, like where to put the "presider's chair" or the total submersion baptismal font (looks like a bathtub).
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No.  It was Vatican II

Wow, I don't remember ever seeing a tabernacle in a NO sanctuary. Heard of it, but haven't seen it, save perhaps in old pics.

Wait, this was on an altar in a NO "sanctuary"?

I've seen Tabernacles in N.O. Sanctuaries. I've heard it said that the N.O. in Texas is more pious then in other states. I've even seen them reverance their Tabernacle.