Small Career Fair on Zoom Meetings

[chk251]

My small nonprofit is hosting a career fair for our program graduates on Zoom. We're anticipating about 60 people, so it's not a big enough event to really justify buying Event add-ons. We are trying to keep it simple by using Meeting breakout rooms, but we'd like to have enough control where people who join the breakout rooms form a queue instead of all being let in at once. Ideally, the employer for each breakout room would be able to let in 1 person at a time for networking and 1:1 conversations without everyone being able to hear them. Is this possible? Or are there other Zoom add-ons that would help us create more privacy in breakout rooms?