W205 C63 saloon Spacers / lowering/ upsize tyre advice

[AsadC63]

Hi im sure this has been asked before but cannot seem to find the post.

I’d like to upsize the tyres to PS4S, what is the recommend upsize? I have 19” atm.
Also spacers size? I normally go 12mm front and 15mm rear would this work if I upsize the tyres.
Lastly looking to have eibachs fitted soon, would all the above I mentioned work?

I would appreciate any advice / pictures you have
Thanks Asad