@johnnotkathi Those jumpers look decent, just make sure to get the directions right when you install them. Pre out -> Main in. It is a super easy update, just pull the metal jumpers out and replace them with the cables.
I used the Schiit Freya+ as a replacement, along with Blue Jeans interconnects, it is one of the most cost effective preamp upgrades out there. If I did it again, I would likely opt for the Schiit Kara, as I did not use the tube stage of the Freya much, even though it did sound great.