I don't see why people don't like tape
It's lighter than a battery strap, it also reduces the risk of tweaking if you have a crash and helps a little with side-to-side (left and right equal) with batterys getting heavier and electronics gettting lighter. Just get some proper strapping tape with a backing on it for extra strength
.......but if you want to use a strap i've seen people use the xray strap. All the had to do was counter sink 2 holes where the battery tape should go through then tighten the strap.
Charles