So this is a very biased answer based on my experience, but take it as you will.
I applied to those summer research programs for last summer and didn't get any invites/interviews anywhere. I was pretty bummed because I had really gotten my hopes up about the the great research experience + decent cash for the summer, but I ended up finding a clinically related summer job that I worked instead (pm me if you want more details, it isn't something traditional like medical assistant or EMT). By the end of the summer, I was so glad I had done that clinical experience and actually worked with patients hands-on and now as a current applicant it ended up being a much more impactful part of my personal statement/resumer as a whole.
This is especially because I otherwise also did two years of research at my university, so I think the clinical experience I added is much more impressive/meaningful for my app than adding a summer of more research.
Furthermore, a research assistant role at your university will likely be 1000x easier to obtain than one of these summer gigs, and potentially more beneficial for you in the long run because if you put in 1-3 years as opposed to one summer of research, your experience will be much more impactful on your application. Adcoms would be much more interested in a publication in your 2nd or 3rd year of research at your university than they would be in an obligatory summers-end poster.
Ultimately, I'd suggest you get more diverse clinical or volunteer experience during the summer and spend sophomore-senior year in a research lab at your university since this is something that's fairly easy to juggle with school whereas a really interesting clinical experience might be harder to fit in other than the summers. The key is to not sit in the background and merely check a box for research. Take an interest in the research and explore poster and publication opportunities to make your actual interest in the research clear to future adcoms.
Anyways, I feel as though maybe I rambled a bit but feel free to ask me to clarify something if need be.
