Planning electrical systems to be future-proof

If the basement is not so important visually, you can install a surface-mounted network socket and run a patch cable visibly to the access point. That's how it's done in our office building because the APs were added several years later.

With some luck, the access point has a little space on the back where you can place something. However, you have to organize an original access point and try it out. Even if you manage it now, a new access point might have less space there in a few years.

The easiest solution for me would still be the spacer ring between the ceiling and the access point, where you can accommodate the cables. The access point just won't sit flush against the ceiling anymore.

Otherwise, have a hole made in the concrete ceiling.

Core drilling would also be my advice. I had it done afterwards as well, since I decided relatively late to place a KNX flush-mounted presence detector there. It went without problems.

One could alternatively try to directly attach a plug to the installation cable. At one location in the house, I solved it that way myself, but it was a wall with a cavity behind it, so I could push the installation cable back to the appropriate length. Fiddly, but the access point is running, sitting directly on the wall from which the installation cable comes directly.

The electrician only installed an empty conduit from the ceiling there. I probably won’t have any chance to get the installation cable and patch cable into the access point, right?

With a Unifi Nano that should be no problem at all. Just the patch cable - power over PoE.

As long as the ceiling has not yet been poured and only the prefabricated ceiling is in place, all options are still available. Later on, it will require more effort or, of course, [Keystone] on the installation cable or even directly [rj-45] connectors.

Even better patch cables with TM21/Hirose connectors are difficult to accommodate. The "Infield mounting connectors" are even larger and unwieldy. They do not fit behind any access point. And you wouldn't really want to use regular RJ45 connectors, especially in connection with POE, would you?