If the Xiaomi router can’t find a signal, no other router will either. I get the impression it’s also the one with the best transmission and reception capabilities. Of course, the highest vantage point is the best. In the Allgäu, at my holiday ‘house’, I had it in a plastic box at a height of 12 metres, above the vegetation. It worked a treat then.

A general question gets a general answer.

It depends.

If you have a suitable mobile phone provider with a good 5g network, the router is absolutely top.