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Or just use a Mikrotik router which has Wireguard support built-in.

This is only for Mikrotiks that uses ARM processor. Some older that runs on MIPS doesn't get this update.

Wireguard support comes with RouterOS 7 (ros7). I'm running ros7 on a MIPS device (mAP) and it works fine. What device(s) are you talking about?

Wireguard is available on all architectures, since RouterOS 7.0.

Zerotier is the arm/arm64-only package that you probably had on your mind.

Hm... probably this confuses me.

Yes. My FritzBox also has built-in Wireguard.