you can go with a mobile guy but think about what you are going to get.

over all quality is going to be better if installed in a closed clean shop. not to say you can't get a good job from a mobile guy but you have to consider other things also.
first off do they even have insurance so that if they damage your car it will get fixed? professional tinter's are good but are human and what if..... now the hacks are not going to have you covered at all so good luck with that.
second, are they an authorized dealer of the film they install? if not, your so called lifetime warranty just turned into toilet paper. check the details.

just drop it off at a reputable shop leave it for a few hours and pick up your sweet ride.