I tried both ways to link it and it didn't work. Guess I don't get on the roll LOL.
Best way to mod the G10 is to use the "spider plate" from the stock card, the little spring plate from the back of the GPU to make a template to drill the holes in the back plate of the G10 (the small plate). Or you can template off the copper cooler legs in this case, it's probably better. Once you have that sorted mount the screws to the plate and fit the assembly on the card with the screws pointing up. Use white paint pen dots on the retention screw ends while lowering the main plate centered as best you can see - your eyes are remarkably accurate and i refer to this as the "eyeometer". drill the holes in the main plate and widen them with a small rat tail file if required or drill them larger. Careful drilling.
As long as you have the system reasonably centered it's not critical, just ensure that the coldplate clears the VRM and covers the GPU & HBM. You (very important) seat it firm with your hand, then while applying pressure hand tighten the screws to just seat, not tight. rough measure the screw length and make sure the coldplate is level as can be, then tension each corner in an opposing pattern like wheel nuts but only 1 turn to start then .5 turn then .45 until you think you will break something, then give it a little more, it has to be F*kin tight or you waste the cooling potential. These AIO coldplates are convex and need a bit of tension to flatten out.
Sounds scary but really not that bad. Be careful and think your next step and you will ace it. Be an architect, not a bricklayer and you will be fine.