The term "shady manager", in my opinion, is withholding pertinent information or being misleading in order to lock owners in to a contract and then take advantage of them. 

There may be exceptions since many workers are forced to work remotely due to COVID.https://taxnews.ey.com/news/2020-1274-georgia-provides-guidance-concerning-the-assertion-of-nexus-and-income-tax-withholding-for-employees-temporarily-working-in-the-state-due-to-covid-19 This is for employees working IN Georgia due to COVID, which is the opposite of what we're discussing.

As someone with a lot of experience in the field, I get so tired of the companies offering to "help" for such egregious fees.I have worked for a few RE investment groups, with projects up and down the East Coast, with holdings of $5m - $150m.

LLC's could provide tax advantages in states that with tax withholding laws, but again single member LLC's won't typically provide those advantages.     

Potential applicants , assuming they are serious, withhold nothing.PS: A potential bad tenant will infill your interview questions with additional useless information to distract you and redirect the interview, they are often sickeningly sweet, offer to do work for free, rave about how great they think the place is, brag about there gardening abilities etc. 

@Linda HastingsI agree, there is certainly a lot of speculation, but potential returns, over time even with holdings costs, can beat the stock market and perhaps even private lending.

Also it's a pain in the butt all kinds of special back-up withholding rules and extra reporting requirements. 

Sellers do it mainly for these reasons.1. they are upside down  2. they are in foreclosure and credit is already thrashed.3. slick talking buyer who withholds info.most if they talk to an attorney or some advisor that person will tell them not to do it.. best to just sell and get mortgage out of their name.But if the buyer is substantial enough and can prove it there are some ways that are semi safe to set this up.. but bottom line Seller has deeded away their interest and if their buyer goes sideways its a freaking mess for them..

Can I just submit a 4th quarter 941 showing my salary and pay the necessary withholdings through the voucher? 

Account ClosedThere are added complications when there are foreigners wanting to invest in the US.Do they need an ITIN.Will the entity you have setup in the US be taxed differently for them in their countryIs there a Tax treaty between the US and their countryWill the income be considered ECI(effectively connected income) or FDAP(Fixed Determinable Annual Periodic)Will there if FIRPTA tax considerations on the saleWill there be withholding requirements on an annual basis on their incomeWill the foreigners be required to file a US tax return