Question about using YubiHSM2 as a Validator

Our team have purchased YubiHSM2, but we are not sure how to implement the usage of YubiHSM2 to Gaia. We came up with two questions related to this issue:

1. What are the types of work required to fully utilize YubiHSM2 for a Cosmos Validator?
2. What is the name of the key file for Gaia testnet?

Please feel free to share any recommendations related to YubiHSM2 or any other hardware security modules