glinet can do all this and even better with 3 different gl-inet routers.
- no longer single points of failure excpet for gateway router
- 3 stong separate wifi frequecies for 4 client wireless network.
- easier trouble shooting and setup
- possibly same or lower cost
neg
double nat
more power plugs and possibley more power consumption.
doesn’t look pretty but when guests come over. who actually has there vpn adblock router perched on their coffee table like the display ad? 
how: assign gatway router to guest-net=vpn1, lan-net= ISP Internet / Home network and they other two with both wans an gateway router lan-net.