I've had offers on Flip and had a look around, but I can't see a way to send the domain to auction, with the opening offer as the starting bid in an auction, is that not an option?
If there was, people could send domains to auction with a starting price matching the initial amounts offered.
You could set a reserve instead!
The system only allows me to have 1 reserve price auction at a time, and I had 3 offers on Flip today, so can't set a reserve for each.
Are you using flip landing pages?
No, all my domains are parked at Dan.com, no nameservers set for any at Flip.