How do I select the right BaseUnit for the new F-DI module?

Please also see the attached screenshots.

I need to insert a new F-DI module in node 44 (and node 43) in my project.

I know I will install a F-DI 8X24VDC HF (6ES7 136-6BA00-0CA0) but for that I also need a new base unit.

Which base unit (of the 4 options shown in Industry Mall is the right choice and how do I determine this?