Yes you can. If you had an array of ultrasonic transducers around the body you could have each of them in phase targeting a single spot. Beamforming is a thing we've been doing for years with RF. It's even more trivial with sound.
You just gotta catch the right wave
I’m not aware of strong evidence in this area (not saying you’re incorrect).
For the liver indications, several elite radiology departments have had very poor outcomes with their patients, despite the strong public data. I would not, with my own prostate, try a new technology until at least a decade out, at least.
This technology is also now used to treat non-cancerous prostate enlargement (BPH).
There are other options besides prostatectomy or the untested histotripsy.
Histotripsy is early in its clinical life but I wouldn't say untested.
People who aren’t in medicine are very susceptible to advertising - this is why I’m writing so stridently
And a review: https://pubmed.ncbi.nlm.nih.gov/36686753/
Fun fact: using this ultrasound for prostate cancer treatment reduces the risk of erectile disfunction