Speaking of camber bolts and front camber adjustment in a P80 Volvo, @242GT and @rado, you typically don't need to do anything/much here for a road car, though you will when you lower a car it can be handy to help get it closer to optimum spec.
There isnt any 'real' camber adjustment on the front, other than making use of the slots in the tower and using these to move the strut around for alignment.
If you need to go beyond this (more common with very low ride heights or trying to accomodate more aggressive wheel offsets), camber bolts are a good solution as there's no adjustment for camber via the control arm.
In theory, you might be able to shim the arms back and forth to change caster, but you'd be messing around with bushes in the arms and I'm not sure you'd be able to gain that much (if anything) to justify any effort here (unless you made up your own arms, as Michael Bennet has done)
We do camber bolts for them too - EIbach, H&R and an unbranded offering that I'd swear actually is the H&R product.
To go beyond this in terms of camber and caster adjustment, you could move to an adjustable strut mout. To make the most of these though, you'd need to be running coilovers as the smaller dia of the spring allows you more freedom to to move the strut around in the tower (smaller package size of the strut assembly allows for a greater range of adjustment).
For a road car though, I dont see a case where you need this sort of range of adjustment
One good reason to opt for an adjustable strut mount in a P80 though is simply that the oem type spring seat and strut mount doesnt have a super long service life and replacing them is annoying.
In our car, since we resell some BNE products, I've got a BNE set in it. The biggest reason for me to do it was simply that in the event that I have a failed strut mount or spring seat, I need to separate the reservoirs from the Ohlins struts due to their design and therefore I'll need to disassemble them fully, refill them and reassemble them again, which is a pain.
Pic of the mount for context -
