XC60 Widening Track – Need your tips!

Hello Volvo community! My very first Volvo ever arrives next week. I hope it was the right decision?! It will be a 2016 XC60 D4 FWD 8-speed Geartronic. For purely optical reasons I love to give him only a track width of 20-30 mm on the rear axle per side?! The vehicle will be delivered with the original Volvo rim “Lesath” (7,5×19″ with tyres 235/55/19. My questions to you:Do I still have to have a track survey carried out or Does that seem sensible?! Which gauge (in mm) do you recommend? or not? Which manufacturers (..and suppliers) of widenings can you recommend?! Thank you for a few good tips from experienced Volvoians! Tangopaule