Looks simple and neat...But.
That tank holds maybe 19 l when full just estimation.
In a frontal collision your expecting an element made to hold devices much lighter than a fuel cell to prevent that cell driving into your back/hips.
My thinking is although the rear mounts ( plastic tube section) are short relative to the clamping knob thus clamp has greater effect. The front ball's are further removed from the pressure zone the knob will apply. I think those balls could/would pop out the ends of that length clamp with anything about say 10l of fuel.
Just my thinking. Is all.
Lots of fast change hardware out in the marketplace designed for this job tdragger. I use
http://www.ddbarry.com.au/contact-us/ for lots of good stuff.
Some things in the indexing elements might be better. Designed for work in shear.