Best wireless internet?

For context we live in Brookline, so not exactly Springfield but I figured someone would be able to give me some insight.

We have T-Mobile 5G internet right now and it’s kinda shit. We live with our in-laws and they refuse to let us get actual internet bc they don’t want a hole drilled into the trailer.

So any internet available without having to drill a hole or have anyone come in the house. Just looking for recommendations that will give better speeds!

Thanks in advance!