Lots of great threads on this and I'd suggest doing a search.
@Sid Kafizz - Masking (or painter's) tape is your friend.
@CayIman is spot on with this. I also like to use string in combination with that as well (as I did to mount my rear view mirror in my E30 convertible this past week). Coincidentally, I'll need to break out the masking tape again today as I have something else I need to center on the car.
On both of my P-cars, I went with Sto-N-Sho removable license plate holders. No drilling into the front of the bumper, which you can't correct later on -- and they mount from the bottom using 3M VHB tape and a few screws. Plus, the front plate comes on/off in a moments notice (great for car shows, etc.). If I was AX/HPDE-ing, I'd remove the plate before runs. Strongly recommend.
Before this, I ran a removable tow hook license plate for two years. Despite using blue Loctite, I hated it as it would spin and bend. Plus, it looks awkward as it makes the front of the car look unbalanced. Finally, someone could easily come over and snag your plate (very not cool if you have a vanity plate). Was eager to get rid of it in favor of the Sto-n-Sho. BTW, I think they also offer a military discount, which is way cool.
Not sure I agree with
@theblooms suggestion to run without a plate (it depends on your local LEOs), but to each their own and risk tolerance. Here in MA, unless you've got a "greenie" plate that's 40+ years old, you must run a front plate. TBH, I'd rather not be pulled over in my super-obvious P-car for something simple as not having a front plate. Plus, we have a ton of bridges and tolls up here in the Northeast where "Pay by Plate" is a backup if your EZ-Pass is wonky. Wish I could run only one plate, but I respect the law as well. YMMV.