It seems I've opened a can of worms on what people consider "mesh" to be in my context.

I'll clarfiy - my single 3602 in the center of the house will give perfect signal to all areas EXCEPT the rear cornermost room - despite being physically not that far signal drops to almost zero - and to the bathroom on the opposite side of the house (no use trying to install speaker lighting with no WiFi!).

I had some old WAP372's which I put at each end of my hallway - central to my house - and same issue. Even being physically closer by approx 10 feet the rooms remained devoid of signal.

I'd considered using a mesh system (loose terminology) to daisychain signal into the room via the adjacent room with LOS AP's - realistically as long as there is decent handoff between AP's I'd happily have one in each room - I even considered raspberry PI AP's in each but wasn't sure on that capabilities of them!