When I was selling real estate I had several owners "invite" multiple realtors out at the same time.
It was interesting to see the looks on the faces of the agents when they realized they were competing one on one with several agents in a face to face contest. That never happens.
Some left, I stayed. It always backfired on the Sellers. They thought they'd get a higher listing price and a lower commission. What usually happened is that the Agents ganged up on the seller and made them realize they needed to be realistic with pricing so they ended up listed for less than what they originally wanted to (a more realistic price) and they always got a full price commission. Interestingly more agents knew about the property and knew the Seller's situation so they showed it more and it usually sold quicker than the neighbors.

