Hard to say, not enough detail. Is paint a consideration, will you be making a custom rack? Top or sides, sloped or level? How much cutout?
If paint isn't a concern, then I would put them in the usual place on the side of the fork. At least for touring, being able to use stock gear in a pinch is an advantage so standard positions with the workaround in your custom rack would make sense.
One trick I use a lot, I invented this (probably for the 1000th time), is to place a threaded insert under/inside the steering tube. This works in retrofit no tools situations, because one can whittle and glue something in there, or you can do it all fancy do a very neat job all metal. It basically works like a crown attachment point except if you already have that filled for brakes, or you want a slick fender point.
Another option is to braze barrels anywhere.