It's not perfect, but I like to read the reviews from residents on the site 

You will be too detached.5 is required in some states and not in others so a lot if left to your viewing on-site so if you are not seeing it in person, you need full photos and videos of every part of the basement and attic so you have an idea of where the trouble lies before making an offer.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Put up a website, go knock doors, go talk to retirement communities, divorce attorneys, GET OUT THERE it's really not complicated. 

Am I better of just running my own rental comps instead of using the HUD User site?

I'm trying to sell some prime building lots right now and all of the builders I've talked to don't want them mostly due to being backlogged on work thanks to labor shortages and not wanting to deal with the huge hassle and time commitment/expense to get a building permit.Ironically, politicians in the past have contributed to the problem by actually going to job sites to round up and deport workers because many are undocumented.

Land acquisition, entitlement and zoning, permitting and site plan, construction budgeting, and then at that point, we do the last piece which is cost of financing.

Settlement shall occur within, or at such other site as the Buyer may select, provided that the Buyer shall have given the Seller at least five (5) calendar days advance written notice thereof.  

At the end of the day vet these lead gen sites/companies on a short-term basis, then flip to something else if the leads are not working while having the right expectations.

Links to your three other posts on this same topic so readers can see what's already been discussed:https://www.biggerpockets.com/forums/61/topics/551577-backyard-homes-produced-in-chinahttps://www.biggerpockets.com/forums/617/topics/551580-china-built-backyard-homes-socalhttps://www.biggerpockets.com/forums/61/topics/537480-tiny-homes-produced-in-chinaThis sort of house is an interest of mine, though I'm more interested in building them on-site with a 3D printer and local materials.