Hello. Iām Leo, from the Flashbots team.
We are interested in working with Lido, of course 
Our mainnet relay is ready for validators to register:
We are working on a definition of trusted relay, making sure that our relay complies with everything in that list of requirements, and talking to other relay and validator node operators to reach an agreement. Please take a look here:
publicly available
publicly listed & maintained
open source
transparent about what (if any) transaction or address filtering they enforce: Flashbots filters transactions that interact with OFAC sanctioned addresses. More details here as we get more legal clarifications.