Is there a portable remote car starter?

Does anyone know if there are portable remote control car starters with minimal installation? I had one installed for my mom a few years ago and she sold the car and forgot to have the starter taken out. She absolutely loved having it and doesn't have the time or money to get another one installed. Also, she started leasing vehicles so she doesn't ever have to deal with mechanical issues so I'm wondering if there's technology out there that she can like plug in and unplug to move from vehicle to vehicle that I get for her? Christmas is coming and she would love to have it again but I moved out of state and can't just get things done like this for her anymore anymore everytime she decides to trade in. Im not finding anything online that seams to match and of course when I type portable or easy install into my search it's talking about a portable key or phone app lol let me know please if you know of any. Thank you!