The most tower like stand mount under $4k

I’ve owned the Falcon IMF-100. You can get the kit or factory built for under 2 grand shipped ( no tax). They are sold factory direct only. They are a Transmision Line design. I received them in less than one week after placing order.

IMF 100 “Complete@Home” LOUDSPEAKER SYSTEM (falconacoustics.co.uk)

Review!

https://the-ear.net/review-hardware/falcon-imf-100-standmount-loudspeaker/

KEF R3 Meta bolted onto their bespoke stands, My dealer has told me since the original R3 was introduced that "the R3 is the best-selling floorstanding speaker that's not a tower" he's ever offered. And sold a LOT of them.

Ref 3A de Capo vs the Ref 3A  Episode BE

I think you need to reevaluate your definitions a bit. Tower speakers are not necessarily more accurate, musical or anything more than standmounts. Some may have a deeper bass or fuller bass because of the larger cabinets, but that’s not necessarily the case either.  Second, a standmount speaker on a stand may not take up any more floor space than a smaller standmount. If you’re looking to put them on bookshelves, that’s another story, but unless you buy a speaker made for that, like Wilson Duettes, you are really compromising the sound. 

Look at stand mounts with a passive radiator or larger cabinet to give you a full sound and tower quality bass.  

mofi sourcepoint 8 have a huge sound

buchardt audio s400 has very good bass

deftech D11

legacy audio calibre (used if possible, awesome)