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

https://www.thingiverse.com/thing:4162889

https://www.thingiverse.com/thing:4108102