I have the device previously called the E-Pass Xtra. now called "Uni", which is good in 18 states. Because of the Class C overhang possibly blocking the signal, I mounted it in the center of the
bottom of the windshield, and have had no problems.
If you're going to use the sticker type Sunpass, it should work if mounted low on the windshield.
Info re: the "
Uni" - - ->
https://www.cfxway.com/uni/