RSK = Rotary Salmon Killer. I bought mine at Englunds in the "repacement pack". All you get is the plastic part and several to the pack. A lot cheaper than buying the "pre-tied" that I just disassemble and toss their junk anyway.
FYI, every fish we got so far this year (15) were hooked on the bottom hook, spinning free by the tail.
I prefer solid rigs but slidders will work. Make sure you use quality gear (Maxima, Owner, Gammie) and tie good knots and you should have no problems.
There may be something to using the snubbers for fresh-from-the-ocean 'hos. I have some but have not used them since we target big chinook and take the coho when and if they happen by. The snubbers are easy to make if you can't find them in the stores. All you need are a couple big swivels, the tubing, and enough tuff line to run down the middle to ensure that the tubing does not break on a big fish. Tie the tuff to one swivel, drop the line through the tubing, stuff the swivel into the tubing, tie off the other swivel, put the extra tuff in the tubing and work the tubing over the other swivel, you're done.