Our free NY issued E-ZPass is mounted in the lower left side of the windshield on the coach. That's where the previous owner had his, so I just used the tabs he left. On our previous coach, I installed the E-ZPass in the upper center of the windshield, just below the tint line. Both locations have been trouble free for reading so far. We have two transponders for the coach, one for when we're towing the toad, and one without. Both are registered to our NY Thruway Motorhome Plan where we get charged passenger car per axle rates for the coach, instead of the higher large vehicle rates. We pay no monthly or annual fees for our automatic replenishment account.