New tires

A Alignment is not a bad idea and helps with tire warranty if ever needed !
They like records of what was done, Less chance of them refusing repair or replacement !
Also can help with the life of the tire as keeping the wear even

...and be sure to have all 4 tires balanced - but don't bother with the "force balance" expense.

If the old tires had unsatisfactory, uneven wear patterns, you probably need an alignment. If they didn't you don't. Absent other things like pulling to one side or the other, of course, but that is generally visible in tire wear too. Also assuming an acceptable tire rotation interval was followed.