This is a hard question for me to answer as someone helped me on the setup and I had no clue on how to do it even with looking at the instructions!
But I also feel the setup is wrong on the home A ssistant part.
This is the version I installed no clue which it is though!
So if I cannot use add-on how do you get add on onto this setup or do anything? 
Also which out of the two the 1x Home Yellow Kit with power supply
Raspberry Pi computer Module 4 - 8Gb Ram 32GB emmc, 24/5.oGHz wi-fi fi Bluetooth
5.0 cm4108032
with adding a ssd
or a Raspberry Pi 5 with 8gb ram and also add a ssd
Im also trying to get a MQTT working why I’m trying different methods!
So far I think the Yellow is starting to behave its self and stopped dropping out!
Which as been a bonus this week!
What about this setup Installing Home Assistant OS using Proxmox 8
Woud this be a full HAOS setup to attempt?
On a Ikoolcore R2