Ah, that’s probably a better process than our house’s trick of having two separate MA EZPass accounts simultaneously associated with the same car in order to get a second transponder I can use when I rent. (Our way makes it hard to predict which account gets billed in the rare occasion that they have to fall back to the license plate because a transponder read for the double-associated car fails.)
My sample size is not huge, but personally I’ve never had a problem with associating mine with a rental using the timestamps of my rental contract and indicating that the car is a rental.
I recently drove to DC and back playing dances in a rental. I paid cash tolls when available, but that often wasn't an option, so I ended up paying $40 in PlatePass charges in addition to the $63 in tolls. Time to get an E-ZPass!
What makes this tricky is that I don't own a car. Well, I have half a car, which does have an E-ZPass, but that stays with that car. If you go to sign up online you'll get through to step 5 of 7 and then:
Then you call customer service, and when you follow the prompts to tell the automated system that you want to open an E-ZPass account they tell you this must be done online and don't offer any other options.
If you do get through to a person, for example by pressing 2-2-9 to tell them that you have a question about your account but have forgotten your number, they'll tell you to go online to their Document Library, fill out a PDF application, and fax it in. The only difference, as far as I can tell, is that the PDF form isn't capable of complaining when you don't enter a license plate number.
Which worked! Now I have a transponder, and when I want to rent a car I can follow their instructions to add it to my account as a short-term rental.
Note that you don't have to be an MA resident to get an MA E-ZPass [1]. Several states have fees or inactivity charges, but MA is one of the ones that doesn't. If you drive a lot you'll often make up for the fees by lower in-state tolls, but if you don't then it could be worth getting a fee-free one from MA or another no-fee state.
[1] This is actually a requirement for offering discounts on MA highways to MA EZ-Pass accounts; see Yerger et al. v. Massachusetts Turnpike Authority:
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