Update after use: can no longer recommend the router. Trouble so much with radio disappearing and restarting is the only solution. OpenVPN is no longer a usp because Wireguard is what it is today. Had I done something different today I would have bought a really good router without wifi (type of edger router or microtics) and bought separate access points.
Unfortunately, this is not the first Asus router I've had that failed and, stupid enough, I thought this one was different.
In short: buy something other than Asus.
Replaced an AC68U. OpenVPN server delivers 250+ Mbit in both directions with Asuswrt-Merlin. Wireless performance surprisingly much better than previous router. Bought for SEK 1590 during Black Friday. For that price, there is nothing better. This router is identical to RT-AC86U.