Here is a picture of my spool holder
On the left is a spool of serger thread and on the right is
embroidery thread. Background is smaller cones of embroidery thread, large spool from ThreadArt 4.99.
The holder usually set to the right of my sewing maching.
On my Kenmore I taped a cardboard to the back top side of the machine and put a hole/guide in it.