I have seen some people using screws to mount the track on to the boards and then use 10mm foamboards to make borders.
RacingLine on SlotForumInternation is one of those. You could PM him (I see that you are active there as well).
This could be another nice track from a club in Wales to look at and ask some of the club members: https://www.slotforum.com/forums/index. ... pic=113401
I personally do not like poking holes through the track but if they did it might mean that the scalex clips suck...again a PM to MrModifier or Mcewan should give you some good answers.
Another less intrusive approach is to use a double-side foam tape but I do not have the links to where I saw it used.