Can I buy and just hold a device in case I need it?

I want to buy a Starlink mini that I might use once or twice a year. I know I could simply not pay for additional months after purchasing the device but are there some problems with that I'm not aware of?

I basically just want it as a backup internet for work but I don't want it to be active unless I need to activate it for a month a couple times a year at most.