Archer C6 v2 replacement for 200/20 line

Hi guys!

I'm searching a replacement for my parents router, which currently is Archer C6 v2. But there's a caveat, form factor needs to stay the same or be smaller since the place where it sits is very tight.
Xiaomi 4a Gigabit ticks all the boxes but unfortunately it has only 2 LAN ports, I need all 4 ports.

I plan to set it up with regular stuff like SQM, adblock, stubby, https-dns-proxy etc.

Any suggestions?