The first thing I look at when considering free agents or even value vet free agents is age. I'd prefer to keep it at or below thirty years of age, also I only looked at unrestricted free agents. Based on that here's a list of guys I'd look at from youngest to oldest:
Jedrick Willis (26 years) would be a good target for one tackle spot. Cleveland is in a terrible cap situation with Deshaun Watson's contract, they have a capable young backup behind Willis and can draft another as insurance.
Robert Hainsey (27) has played well for Tampa, he showed amazing versatility back when Tom was there sliding inside to play center.
Dillon Radunz (27) from the Titans is a plus athlete and would look better on an offense that has an actual QB.
Mekhi Becton (27) has had a year in a better more competent situation in Philadelphia, might be worth taking a look at on a cheap "show me" deal.
Tommy Doyle (27) suffered a bad injury early in his career, much like Becton might be worth a look on a one year "show me" deal.
Oli Udoh (28) is a year removed from serious injury and should be better prepared to contribute, play well and would be cheap.
Andre Dillard (29) is having a late career resurgence for a former #1 pick who didn't reach his potential, he has played well for the Packers.
Joe Noteboom (29) would be a great addition but he's one of the Rams few really good linemen and they're not exactly in cap trouble, he'd be an instant starter though.
I'd also bring restricted free agent Demontry Jacobs back and make sure he had his own personnel strength and conditioning coach working with him this offseason. They can cut every other tackle on the roster, they should also move Onwenu back inside to guard and make sure Sidy Sow has his head screwed on right this offseason.
There's some other older guys... but they're older and injury prone. These are the guys I'd either throw the bag at, or others who'd I'd bring in for a look on a short money deal with little to no guarantees... or what Elliot Wolf should have done last offseason instead of signing stiffs who can't play.
Regardless of who they sign, they should draft a tackle with the first overall pick and double dip later in the draft. Go offensive and defensive line heavy.