The strut top spacers achieve their camber offset by shifting the top of the shock towards the middle of the car. Lifted coilovers can achieve their camber offset by offsetting the lower mounting holes. Hotbits camber was pretty close for me. No idea about RS-R, but I wold expect camber to be no issue. You can also get aftermarket camber bolts front and rear to fine tune your camber. Caster on the other hand is harder to offset on a coilover, but still possible. The Hotbits do not caster offset, so I actually have very little caster. You can get offset top hats and offset control arm bushings to fix caster, but I personally haven't been bothered enough to get either.
I have no doubt RS-R can make springs that ride nice on road. However you just need to make sure they are barrel springs as once straight springs get longer and softer this happens.
View attachment 4028
I confirmed this the hard way...
Not sure about RS-R, but most coilover places like springs in the 4+Kg range for onroad handling. For offroad you really want to be closer to 2Kg.