I second, stay away from Ubiquiti equipment. I used them at first for a few years, and have since gone over to Mikrotik. If you're in a valley and surrounded by trees you're going to want lower frequency service. 600-900mhz to penetrate the foilage, and even then it prob wont be super fast. I believe t-mobile has 600mhz. You may want to look into installing a tower to get above the tree line. You will also want your modem as close to the antenna as possible to prevent signal degradation over long runs of coax. I would prob recommend the Mikrotik LHG LTE.
It probably cheaper just to buy one on amazon and test it out.. if doesn’t work send it back.. this is what we use until my preorder gets filled... MikroTik LHG LTE kit-US https://www.amazon.com/dp/B07HYLPN3T/ref=cm_sw_r_cp_api_glt_fabc_ZR8VEFWM14TP99SARCE8
Before I went Starlink I was using an AT&T SIM card and one of these
MikroTik LHG LTE kit-US
https://www.amazon.com/dp/B07HYLPN3T
Inside the house I could only get 0.2 Mb/s but using this dish I was reliably getting 50Mb/a