It can be difficult to impossible to install those without removing the front fascia. Instead I just used 3M emblem tape for my Hellcat emblem and it has been fine for the almost year it has been installed.
I was nervous when I heard about this method but I too used the 3M double sided mounting tape on my grill and I've had no issues these past 14 months although I used it for a plastic (not metal) Scat Pack emblem. There have been many posts stating that the removal of grill emblems are very delicate and near impossible on the new grill. You have to VERY carefully get behind the grill and cut those tabs. The best and easiest way if you don't want to save the emblem is just cut it up. I didn't want it saved and I was able to remove it easy in less than a minute with tie wrap scissors. Good luck and show us how it worked out and a picture of your finished product.