Wish there was more space on a 964 bumper around the license plate...I did consider that as a location. I'll double check mine again (not at home), but if I recall I only have maybe 2-3 inches to the sides of the plate..similar to:
https://rennlist.com/forums/attachments/964-forum/585115d1322019111 ...

I originally had all the badges mounted with the hardware provided when I bought them and I Macgyvered some washers to get it to hold. Over the years the small nuts eventually failed and I discovered I had lost one of the nuts. I can't remember if I used loctite on them, but in the age of the 3d ...

LOL - I bought my 2015 S in 2022 and thought those were OEM since they came with mine! Didn't realize until seeing this post that they are likely the exact same items you have in your post.