rated to 10A which is probably a little overkill.
Remember that 10 amps at 12 volts is only 120 watts - whether a lower current rating is OK will depend on what kind of device(s) you want to power. And the input side (24 volt) will see only about half the current (5 amps in the case of the unit I linked to).
I don't see any problem with putting a simple splitter into this to turn it into 2 sockets...?
Should be no problem as long as you dont exceed the power (current) rating for the voltage converter.
Not sure where you are located, but you may want to think about how you install this. In the U.S. the FAA would likely require a permanent install of the device to be approved by a FSDO, or at least a Form 337. If not attached permanently to the airframe,
AFAIK, no documentation required. I often use industrial sterngth Velcro for devices like this to achieve a secure but "non-permanent" installation.
