I replaced my extruder and hot end with the Hemera on my Ender 5. I needed a way to feed fialament into the Hemera from the top. I remixed the great design by jastyn bala to mount on the top 2020 extrusion. One bolt and t-nut on each side holds it great. It is adjsutable to what ever width you need. I have included some axle designs, but you can use almost anything. I did run into a problem with the fan hitting the spool when homing to 0,0. I added more height and now have the long spool sides. The box design that goes around the 2020 extrusion holds the supports very well.
I added some longer sides so I can mount from top or bottom. When mounted from the bottom use the filament guide and light bar with top filament guide. All of the mods are here. https://www.thingiverse.com/thing:4108102
CHECK OUT MY COMPLETE MOD SETS FOR THE ENDER 5 AND ENDER 5 PLUS