Rails are designed to be as versatile as possible. If stock grab handles are used, best option is to install L-shaped brackets in the front and middle position (Note: we used to provide flat brackets for LHS, but we decided that L-shaped brackets works better, so now we include only L-shaped brackets, both for RHS and LHS). If stock grab handles are not used, rear and middle position of L-shaped brackets proved to work best.
It is also important to note that straps can be inserted in several ways, but here is what worked best for us.
A picture is worth a thousand words, so here are several examples.
Tool tube can be mounted directly on the Rail base, no need for L-shaped brackets.
When stock grab handles are removed, all these bags (and Tool tube) fit great under the large rack-less systems, like Mosko moto Reckless 80 or Giant Loop Siskiyou panniers, acting as a perfect stand-off, pushing the sides of the bags away from silencer or swing arm. More details on how Reckless 80 fits with Rails - here.