FortiFlex license for IPSec VPN

hi,

we’ll loan a FG 100 F from our DC colo vendor to build a temporary IPSec VPN back to our HQ.

this might run for 2-3 months that’s why we’ll only “rent’ the FW.

my questions are:

1.do i need to register the device to our FortiCloud asset?

2.do i need to apply FortiFlex license for HW/OS coverage in order to use “higher” crypto protocols, i.e. AES 256, SHA 256, or do these come free?

can i just skip items 1 and 2 since this is just a “loan” and temporary build?