I would try and put as much distance as possible between the smoke detector and access point, say at least a metre. If they are very close that could affect the performance of each unit due RF interference. Certainly the access point is going to work better away from any other electrical devices.
The AC-Lite I would not recommend having had one. Build quality is poor, it's just snaps together like a cheap toy, no screws! The LSIs run very hot and the heat sinking is nothing more than a foam heat transfer pad between the back of the board and the plastic case. Plastic doesn't make a good heatsink! On my unit, the heatsink pads weren't even placed correctly behind one of the chips leaving an LSI to bake. There were also issues with devices connecting reliably, and the blue LED is over-driven to make it bright enough behind the light pipe ring that after a year it had noticeably dimmed, okay just a cosmetic issue but shows the cost cutting on these units as they should have used 2 or 3 LEDs and run them at a lower current.
This is why I ended up replacing the AC-Lite with the XyZel NWA1123, similar price but a considerable difference in build quality, anyone comparing the two in the hand would immediately understand my comments.
Just my opinion on having compared the two, there will be people that swear by the Uni-Fi products and use them in their thousands.
Edit: There are some images here of the foam pad heat sinks against the plastic case and instructions on how to "unclip" the case. https://community.ui.com/questions/How-do-you-physic...
Some images on Google do show AC-Pros with metal heat-sinks now on the chips rather than the attempt to use plastic as a heat-sink. Or they might have been retro fitted by the owner I don't know.
Edited by PhilipD (Thu 22-Aug-19 08:15:03)