Collapsible Aircraft Ferry Tanks - Turtlepac
That's the type I have seen.
Why on earth would you want to push fuel in the wrong direction up a fuel line when it can go straight to the engine? Your doubling if not tripling the number of things that go wrong.
Apart from which there is usually baffle flaps in the tank to stop sloshing to the wing tips.
The only time you might have issues is if there is a return fuel line from the engine with injected engines to the fuel tank.
Then you would use one tank until it was quarter empty then use the ferry tank until it was 3/4 full again and repeat. But this has a huge gotcha in that if you forget to swap back to the main tank to empty it down again the fuel pump is a high volume constant pressure pump and it will vent vast quantities of fuel over the side through the tank vent in minutes if you leave it to over fill the wing tank.
Mariner if you fly it like any other aircraft without a chute, and don't alter your flight profiles or decisions because you have the chute, use the training which is available to you through the cirrus training schemes I am pretty certain you will never require to use it.
Then you will be an alive none idiot.