Something to consider: if you have a large conference room (>14 people) you should be looking at something more like UC-CX100-T (or Z). M50/M70 are reliant on the tabletop device and table mic for all audio, when really you should be considering an integrated audio system to cover the room effectively.

Having an L1 in the room will be fine for your video, but if everyone is 5-6ft away from a single mic in the middle of the table, and everyone's listening to audio coming from the tabletop unit, you might not have a great UX there.

Ultimately - yes, L1 will be fine, and offers a good alternative to PTZ, with AI 'Genius Framing'.

But don't forget about the audio bit.