I have one on my Hurricane, mounted in the center of my windshield about a foot down from the top. It has worked for every toll road I have encountered so far.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
EZ Pass in Houson, Texas instructions from EZPass specific for RVs ... bottom of windshield in the middle ... of course they have the license plate so if the pass is not read they just charge the account accordingly
Our EZpass and SunPass are in the center of the windshield, just below the bottom of the sunshade in motion position. No problems. Just wish there was one global pass