Flexi Brake Brackets

[voucht]

The inside diameter of brake lines is very small, and the brake fluid does not "circulate", it is just "pushed" back and forth a few mm when you push on the pedal. So it is not like cooling system where it is important to have the header tank on the highest point of the system in order to allow bubbles to escape, as they can move in the large pipes, and are carried by the circulating coolant fluid.
But when it comes to brake lines, even if your bleed screws are in the highest point of your brake line system, bubbles will not move inside the narrow pipes unless you pump them out. That is the only way to bleed your brake lines. For this reason, the bleeder does not need especially to be higher than the brake lines, it is not important (but it has to be on the highest point of the brake calliper or wheel cylinder of course).
Regarding the front brackets, I think the book's position is good: on the inside face of U1/U2, just under the upper wishbone bracket.
When it comes to the rear brackets now, the book's position is "OK" if you choose to run your brake pipes along the lower rails of your chassis, but if you choose to run them along the upper rails, I think it is better to weld the brackets on RS7/RS7a, between the 2 upper rear wishbone brackets : you will need less length of pipe/hose this way.
Hope this will help.
Good luck