Form rollers may serve a purpose for some people. Other people use just a heavier exercise ball for a lot of that. Most notable the complete back area & hams. Believe it or not, rolling pins (like used in baking) have been used. Which, to me, can make a lot of sense rather than form covered rollers., if any of that is needed for you. Sometimes a proper stretch is all you may need. Proper stretching is an art. Suggest Yoga for a start.
If wanting to experience deep tissue massage (and the pain) than have a couple sessions of Rolfing. Something to be experienced. Actually probably need at least 4 to 5 sessions. It's on a par with getting a tribal tat in Samoa, but at least shorter. Going to feel like a million afterwards, if you live. Sports massages are pretty close to Rolfing. If interested, than go to a professional who knows what their doing. Good Luck.