If one needs several implants, does a single sinus lift operation create bone depth under the entire sinus or does each impalnt require a seperate sinus lift procedure?

I have severe dental problems. I have lost 3 upper molars (teeth #’3,4 and14) and the remaining Maxillary teeth (most of which are already crowned with recurrent decay) are hanging on for dear life. I have dealt with a very virulent oral flora my entire life, along with severe dry mouth and my teeth have continued to decay despite my best efforts. I am hesitant about the sinus lift operation because I am a opera singer. I’ve read the literature that demonstrates sinus lifts/implants have no acoustical effect on a singers voice, but I have spoken with colleagues who say that the problem is how their voice feels after the procedures and that although their sound is not altered, the sensation of singing changed dramatically (since singers do not listen to ourselves from “outside” we are very much guided in our technique by how it “feels” to produce a free and vibrant tone). Having expressed this to my dentist, he suggested an alternative to implants using gold copings/thimbles over 9 teeth and a 12 unit Cantilever Bridge/Splint with the capacity to remove the bridge to address any recurrent decay should it occur. That sounds like a very complicated procedure so now I am re thinking my aversion to implants regardless of my singing (I’m 56, so my career is on the downslope anyway). And so I wonder, if I need to have 6 or more implants (both sides) and if I require a sinus lift, would each sinus be “lifted” with just one procedure for each side or would I need to have ainus lifts for every tooth that needs to be replaced. Thank you for your time and consideration.