If the shocks are of conventional type (not air or booster shocks of some kind) they are not under pressure and will not pop out. All the weight is borne by the coil springs. Did you try a bounce or jounce test to see if the shocks are really bad? A broken shock will usually be quite loose and noisy and the ride will be terrible. A worn shock will have much less resistance to a push than a new one or will have slop when extended or compressed. You could also drive behind the car while someone else drives it and watch for wheels tramping or otherwise moving improperly over bumps.

If just replacing shocks, no alignment is needed. In fact the last time I had my 95-850 aligned the shop said there are no rear alignment adjustments and did not charge for same. The only alignment adjustments I have found on my car are front toe-in and camber.

Uneven tire wear at the rear suggests bad bushings, bent control arms or some other damage.

How many miles were the rear tires at their locations, and was the car in any kind of accident, off-road driving, etc., where something might have got bent?