MT6000 is a great first device and was recently recommended as one of the best "newcomer routers" in Best "newcomer routers" - 2024 - #2 by richb-hanover-priv so that indeed would be a good choice. It has an easy-to-use OEM recovery mode which makes bricking impossible.
From a quick Google search, aren't they x86? Then you can just install it as any other x86 machine by following https://openwrt.org/docs/guide-user/installation/openwrt_x86. The devices that show up in for example the firmware selector are SoC:s that need bespoke firmwares, which x86 doesn't. You will need to install any necessary drivers not part of the base image, but if you're only planning to used wired networking that should just work out of the box.