I put recliners in. Never bolted them down. They stayed in place for 9 years. BIL did the same. Never bolted them down. Never moved.
If you plan on using them for seating while traveling. They need to be secured to floor.
Bradd & Hall sell a clamp for chairs.
http://www.braddandhall.com/productcart/pc/viewCategories.asp?idCategory=58
I have seen the same clamps at other RV parts stores.
2004 Gulf Stream Endura 6340 D/A SOLD
2012 Chevy Captiva Toad SOLD