Upcoming house build

[bluepr0]

Hi!

I'm in the process of researching to build a house and have a centralised place to control lights, blinds, etc.

Needs & Goals

1. Have ESPHome Ethernet boards with relays I can control using regular light switches (momentary switches too) or through home assistants automation. This could be used for lights, blind motors, etc. Won’t need more than 16A per relay
   
2. Have ESPHome Ethernet boards with PWM dimming capability for 24V analog LEDs with 3/4A Per channel. I created 1 channel mosfet board as a proof of concept dimmer with LEDC component from ESPHome and it works okay.
   

Questions

1. As I understand relay boards will work with switches, but Would relay boards work also with temporary switches / push button?
   
2. Are these board 0 delay when activating the relays? My main goal is to have an immediate response from the moment the switch or the command is triggered to when the relay turns on. I have seen some videos where a lot of relays are turned on at the same time and they seem slow.
   
3. Is there any video of relay and dimmer board using ESPHome to see the speed? What’s the max Amp per mosfet channel?
   
4. I’m honestly VERY lost on the product line. I have seen KC868-A8 could be a good fit (at least to do an initial test). A 16 relay version doesn’t seem to exist?. KC868-E16S seems another interesting one but it goes really high on price so I will need to be 100% sure about speed
   
5. I’m still in research phase but I’m assuming a house will need at least 32 relays, and might or might not be all boards in the same placement. So I’m thinking it might not be a good idea to pick one big board but maybe several smaller ones?
   
6. What products do you guys would recommend?
   

Thanks!