I would suggest instead looking into the deployment via the very thorough system here:

https://github.com/spantaleev/matrix-docker-ansible-deploy

It may seem a little overwhelming at first due to the large list of options, but underneath it boils down to some simple variables in a file. Once complete, you can then add/remove components merely with a small edit and redeploy.

I’ve been using this for about a year, after manually doing the systems for Element and Synapse for a few years before that and HATING how kludgy things seemed.

Once on the Ansible deploy from above, features just work. It’s been a night vs day difference without trying to convince you to pay money any time you go into an interface.

My few users (about 2 dozen) regularly do group calls via the newer Element Call stuff (RTC) and even with a high-latency connection from one of the users using satellite internet, things work smoothly.

XMPP / Snikket might be a better fit for your needs, but I wanted to make sure you had a chance to try out the better solution for implementing Synapse (or other Matrix servers!) before just judging by the problematic corporate deployment.