I've considered both options and I'm convinced there's no single best solution to protecting the bike. In my 15 years of riding on various bikes I've probably had five or six of those extremely humbling "tip overs". Low speed and awkward situations that leave me with the bike on my leg instead of under my butt. And one real boner at about 25 mph. that cost me ribs, collarbone and collapsed lung. Oh yeah and lots of damage to the machinery. So with my skill at falling over I think I need the help of the sliders. Just didn't want to drill the holes only to find no way to put everything back together.
Are there others out there who've used silicone to keep the spacer between the frame and the engine block on the throttle side in place when the bolt is removed. Sounds a little iffy to me.