Home Networking upgrade for two houses

f0r3he4d

Apprentice
I'm currently under a home networking redo to incorporate a second household into the mix.
they already have two aps in their house and i have 3 main aps serving three floors and two aps for IoT devices in my house.
I gave them a proposition to move their ISP modem to my house and i'll run an armored cat6 cable from my house to theirs providing internet to their house. they agreed but now im finding it difficult to how to make it work i have to methods planned.
method 1
method 2
i would prefer using the methdd 2 as removes the need for usb nics and lets me have two separate but im unsure if it's possible.
and rpi4 will handle mwan3 with dual stack ipv4/ipv6 with two pppoe connections which wont be a problem i guess.
just need the some inputs on this and the best course of action for my setup
 
You could combine both the plans

make a total of 4 VLANs - 1 each for WAN1, WAN2, LAN1, LAN2 on the smart switch, and keep 1 port for trunking
setup the same properly in the pi4 with the lone ethernet port to trunk with all interfaces on different VLANs on the smart switch using something like pimox.
 
yes this is what i had in mind. why would i need proxmox though? shouldn't openwrt handle tagged vlans itself? .
also another concern i had while chalking it up was considering im using a single phyiscal lan for routing two isps 600mbps symmetrical load balanced and serving clients in the edge case of clients using a multithreaded service like torrents wouldn't i be limited to 500mbps symmetrical because in the case of a physical 1gig port im limited to 2gig upstream downstream combined?