It's not so much the weight of the evap. that has me concerned, as the weight plus the leverage that will be applied by the tubing. Looking at the size of the clip, in relation to the "vaporizor", it is obviously intended to just use the single, centre lug.
I had a lug break off a couple years ago, with my first waterblock hold down, which used one lug, instead of the 3, which I would recommend at the very least.
As far as the MB holes being phased out...that's old news, as AMD dropped it from the spec around this time last year if memory serves me correct, or the new year at least.
Every enthusiast board I have seen since, has kept the mounting holes. You'll have a harder time finding a board that does not have the holes, even though they are not required.
A board that doesn't have the holes, likely doesn't have much for OC'ing options either, (aimed at the oem) so it isn't even an issue, as you wouldn't need a heavy heatsink/wb/etc. on a default running system.
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