I use the hay rack that hangs inside the cage. Any pieces that drop will drop into the litterbox so there’s no clean up.
You can use the litterbox with taller sides or some people use enclosed litterbox.

they are regular triangular shaped litterboxes with 3 bumps inside to hold the grated tray on top. look just like a regular box except for the tray. they work great for long hair or white or messy bunnies. Petsmart sells them also website of fosters and smith I believe have them they are great.

I use some 12″ X 14″ plexi glass with holes either drilled or melted with a hot ice pick heated up in a cnadle flame and mount them on the inside of the cage with zip-ties to keep both hay and stray poops on the inside of the cage. You can also use a cover cat litterbox and just a caution with the triangle ones, be sure that it is big enough for your rabbit. Many times I see rabbits with these and they have to scrunch all up to fit inside comfortably to poop and this will also lead to them not using the litterbox.

LOL Samantha, you can also use “coroplast” which is termed “sign board” which is basically corrugated plastic. I like the plexi glass and that size is available already cut at Home Depot in the replacement window pane section. I like the plexi because it is clear. You can also use a covered cat litterbox as well and also what I use is a small cooling rack from the baking section and imbed it in the litter to prevent digging, harware cloth also works well too.