I am not a lawyer, this is not legal advice and even if it was you shouldn't take legal advice from strangers on the internet.
You can't protect yourself from being sued, especially today now that photos tend to be digitally distributed worldwide every idiot on the planet can sue you for anything.
You have to remember whoever is suing does not have to be right, even if the lawsuit is completely and obviously wrong and there is no way it will get to trial lawsuit can still get filed and you have to waste time fighting it (and if you are smart waste money on getting a lawyer).
And getting sued in the US or the EU can have negative impact on your business even if you do not live, work or even ever plan to visit the country where the lawsuit was filed.
There are countries where you can sue anybody for anything (even if the lawsuit is completely unjustified), so if you take a picture of anything I designed I can sue you for copyright infringement, I can sue you for showing my designs in a negative way (even if I am the only person in the world that thinks you are showing my design in a negative way) I can even sue you for not photographing my design - the fact that all those lawsuits are idiotic and should be thrown out of court doesn't prevent me from filing suits and making you spend time and money defending yourself (and if I have a good lawyer and you accidentally get an idiot judge - or you are on the wrong end of some political fight that has nothing to do with you - there's always a possibility you will lose).
(disclaimer: I didn't read the specific details of the case, this paragraph may contain wrong information, it may also contain traces of nuts.) Even property releases won't help because in this case the designer of the furniture sued, not the owner of the specific piece of furniture photographed (who would have signed the property release).
Sorry to be so negative but the legal systems (all of them, all over the world) are seriously broken and there is nothing you can do except have good insurance (but, if you suspect you might get into trouble, a quick talk with a local lawyer about the specific pictures you are selling won't hurt)