Hello and welcome to the forum.
I think your concerns may be true in that if they are just a seperate cage fitted each side they can be bent backward on impact and case damage even to the engine mount casting.
The most relible that I know of are connected together across the front of the engine (under the exhaust/above the oil filter) as this tube gives a better load path to reduce the impact on the mounting points, one side effectively supporting the other.
Unfortunately I'm not familiar with a current supplier as I'm looking at one that was fitted in the 80's but hopefully this will help with your search.
