I use a trust to own my silencers for me. I went round and round for a while on how to do it and in the end bought Quicken software to make a trust. Despite some people warning me that the ATF could somehow decide that a trust made without a lawyer could be invalid someday, I went with it. It has not been an issue so far.
Just remember to make a copy of the form 1 before you send it in just in case you forget the serial number. I was on the phone asking for the status of the approval a few months ago and gave the ATF employee four numbers before guessing the right one.