Best tool to get owner and their contact info - and how to contac

[DongHui Patel]

Whats the best way to contact sfr owners to see if they want to sell? I have tax records from the MLS but am just getting LLC names or at best a owners full name - but no phone number or other way to contact them. I spent hours on the internet trying to find their info (linkedin etc) - but whats the best way to get their info and more so whats the best way to get a hold of the owners without them feeling annoyed?

NOte I have done quite a bit of work to find these people on the CA SOS and Business search website - finding the RA of the LLC. If you have experience doing this personally please let me know.