Simple Irish/UK socket

Sockets will have the same problem as smart bulbs - if the tenants turn the lamp off at its switch, you won’t be able to turn the lamp back on via the socket. You could maybe get around this by having them use a button (see button FAQ linked in the lighting FAQ below) to turn the lamps on and off, but if there are any glitches they’ll find a workaround and you’ll be out of luck.

IMO the most reliable/foolproof way would be to replace the switch for an overhead fixture with a smart switch, but it’ll be more expensive and more work.

Here’s an FAQ that may be helpful: