Multiple people sharing an account

Hello,
Do you think it is possible for multiple people to share an account with only one email?
Would it work if they used it simultaneously?

I am in a small agency where we already pay for 5 full seats.
Designers have their licenses, but we would like to try Slide Deck for occasionally presentations. We can’t afford to pay a license for all the project management team who could be involved in the Slide Deck work. As the future prices of Slide Deck is not yet knowable, I’m planing for now to create a common email, with full seat, they will be able to share.

What do you think ?