In both cases, to use losses against other income, the owner still needs to meet a material participation test.  

You'll likely get calls/mail from them once you pass your test or even before.

Additionally, a seller should be able to list the house for what they want,  a good agent in response to listing a house above their recommendation should say: "ok, we'll give it 2 weeks - let's try and test the market.  

A lot of times its real estate agents or investor/agent hybrids that build youtube channels for their local market and CRUSH it. like multiple deals a month.

Multiple properties per LLC means that if you get sued at property a, the equity of properties a, b, and c is at risk. 

To qualify, taxpayers must meet specific criteria demonstrating that they are real estate professionals who materially participate in their rental activities.How to Navigate the Rules:Step 1: Identify your real property trades or businessesHere is a list of activities that are considered to be a real property trade or business:RedevelopmentLeasingConversionConstructionReal property developmentReconstructionOperationRentalBrokerageManagementAcquisitionIf you participate in multiple of these activities, you may be able to combine them making it easier to meet the material participation hour requirements.Step 2: Demonstrate material participation in real property trades or businessesThere are seven tests to determine if you demonstrate material participation.

Quote from @Kate Murphy: Quote from @Jason Wray: Kate,I have helped multiple investors use their certificate of eligibility to go from investment to a VA loan. 

Stress test with full expenses and reserves and only move if it’s modestly positive day one.

Not a very good multiple at all, but I kept it and it's worked out very well. 

you absolutely should be advertising in multiple places, just plug in whoever you pick to the system you want after the fact.