The Spiritspring is right near the Walking Mausoleum will help you get on top of it.
Begin by using the Spiritspring jump that is along the northeast side of the cliff near the Mausoleum in Liurnia of the Lakes. This requires unlocking Torrent, which you should have done by this point. Using this gust of wind will take you to the top of the cliffs. Head east along the cliffs to the gravestones and drop down using the gravestones as platforms. Your goal is to be on roughly the third gravestone from the ground.
The Mausoleum will walk right up to the gravestone. There is no need for tricky double-jumps or trying to angle the Spiritspring.
All you need to do is wait for the Walking Mausoleum to walk right up to you. It will come within kebun binatang jumping distance of the platform you’re standing on. If you’re uncertain about the distance, use Torrent to double-jump over.
There is absolutely no need to double-jump from the top of the cliff or try and use the Spiritspring jump to reach the top of the Mausoleum. The building will get close enough to easily reach with a simple jump – nothing tricky necessary.
When you get on the Mausoleum, start smashing the skulls. Alternatively, you can shoot the skulls with a bow and arrow from the cliff.
When you do get on top of the Walking Mausoleum, you just need to smash a few of the white skulls to get it to lie down on the ground. At this point, you can head inside and duplicate any of the Remembrances you want.