Recommendations for a fully OpenWrt compatible device?

ok, probably now I will go off-topic
But I need a device fully compatible with OpenWRT and I prefer to use a new device, can someone suggest me some alternatives?

Why not get router with OpenWrt support?

Or you have a need to use GPIO on top of OpenWrt?

Sometimes installing OpenWRT on a router is an annoying procedure and sometimes the hardware of a router is limited.

Sometimes installing OpenWrt on router is easy, and some routers are powerful to run OpenWrt.

All depends on which router you are looking at, the main point is there are already many official OpenWrt supported routers, also for SBC type, RPi 4, NanoPi R2S/R4S are great as well.