My car has an Allon White Easy Up hood with rear over latches, one side started springing open under pressure so I fitted some black ones that twist and lock into place, you could even put a small padlock on them if you wanted to (I never have). They fold pretty flat so don't interfere with the (Hills Alive) luggage.
I got them from Amazon "sourcing map 2.56-inch Iron Spring Loaded Butterfly Twist Latch Keeper Toggle Clamp with Keyhole - 2 Pcs (Black)" for about 15 quid so cheap as chips as well. They're also available in silver.
P.S. I originally tried some smaller ones but they weren't suitable.
