Will RB962UiGS-5HacT2HnT be sufficient?

Hi there,

I am new here after trying a few Big brand routers to handle my simple home setup. As it is:
Internet 100/40Mbps
Router
2 ethernet connections (NAS, comp), it could be nice to have 800Mbps to the NAS.
18 Wifi clients (with 4 watching Netflix or youtube, 2 streaming tp Twitch), the rest are smart bulbs and Alexas.

That is it, I always had a lag or upstream is bad, downstream is OK most of the time. Somehow I noticed that upload is what routers are bad at handling.

My house is small plaster walls with no bricks on the wifi signal.
I wanted something reliable I do not want to reset is every few days.

I read this forum quite a lot but still a bit confuse as most people sugest hex plus AP, but I reckon this is overkill for my small house in terms of wifi but maybe processing power is what I need.