I'd say that is probably likely, you will know when it is all in, but should be fine. Personally not a fan of multiple tweeters. screws up the sound stage. Looks like 3 to 3.5k at 12db is the recommended crossover point, could go higher given the Stevens range but would think that 3.5 at 12-18 db would suffice, you'll have to play with that. Those are efficient and loud SQL tweeters, should do great. As for location, easy enough to try them out in all three with some adhesive tape or velcroid. Place them in the spots you noted here, listen and see which works best. I will be using tweeter pods for mine, mounted to the sail panels near the corner of the side window and dash front corner.
Might want to email these guys out of Germany, I bought my pods from them and they do a lot of pods for brands such as Xcelsus
https://www.pods-tweeters-midrange.com/
THat is this guy on
eBay - these aren't the ones you would need, but they may make one you can use. I've got a guy on
DIYMA that will make them for about $100 if you need. If you decide to go that route, let me know, he's a bit backed up right now, a couple of weeks out but prints custom pods, does great work and is reasonable.