Solotime does nice work.
Also
EuroPDR
Be careful with magnetic. I have ovals with 8 inch numbers and they ruined my paint in the summer heat. The magnetic sheet gets so hot in the summer sun, it appears to have baked the clear coat on my doors.
I was able to smooth it out a bit with some compound, but the damage is still visible from an angle.
Static cling and reuseable low tack stick on vinyl are alternatives to magnetic.