Yes, the Airwolf is mounted on the firewall. I’ve heard good things about it. My only concern is a hose failure would be catastrophic.
With regards to the F&M (now owned by Tempest), I used one on my IO-520 for years. The only time I had an issue is when a new mechanic would not understand the requirements.
First is that each time the adapter comes off you must replace both gaskets with new. The old F&M instructions were for one copper and one fiber gasket while the new Tempest update is two copper gaskets.
Second is that the torque value is super high and most mechanics miss the difference between the typical inch pounds and foot pounds used in this adapter.
If it’s leaking then it’s not torqued high enough. I would suggest starting over with new gaskets, and try again.
Tempest has a service bulletin and instructions that are very helpful.