Hello mate.
Mine are 7x15 and i struggled

(et35)
You will probably get away with 30mm but ideally need stiffer shocks aswell as lowering springs. Ideally coilovers are the best investment in terms of avoiding problems. It means you can go up or down on adjustables to the lowest possible

At first Mine scraped, had to raise 10-15mm.
The other problem is the clipper kit (if there) cant have the arches rolled due to the way its secured. Nightmare.
Depends how much of a risk you want to take and how much dollar is dispensible...