The challenging part on this last one and many I do is that the bottom plate sits flat on the concrete foundation. How do I angle my flexi drill bit to come back (30-40 degrees?) and exit that plate ABOVE the foundation?

I can see catching the edge of it if drilling from up high with the in-wall speaker opening available; but down low, where the entry into the wall and the sharp turn (back under the crawlspace) may be only 8 or 10 inches max...I can't see how the bit can be directed like that. Entry into the wall is going away from the crawlspace toward the outside.

It would be nice to always be able to drill from up above and then just fish the wire thru. The crawl is enough fun without the added weight of the drill and bit.