How to select an EMI suppressor
Your buck requlator draws a HF square wave current from the 24V power supply. If you want to avoid problems, the issue is smoothing this current.

Your 10µF ceramic capacitors will already achieve most of this, provided they are properly placed and routed.

If you're feeling extra paranoid, you can add a LC filter on the input. This is a capacitor to ground between "F1" and "L1". L1 adds impedance, and the cap shorts the remaining noise to ground.

The inductor should be a ferrite bead of the proper current rating, make sure you get one specified for power lines (like murata BLM18PG series), not one for signal which will not handle much current. As for impedance, I have no inspiration at the moment, so let's say 30-60 ohms.

However there is an extra complication. Since your input supply is 24V and your switcher has an absolute maximum of 26V which is really close, you do want to avoid any ringing on the input voltage when someone connects the power from an already switched-on power supply. The ringing is caused by the capacitors in the supply and the wire and ferrite bead inductance. So I suggest adding an aluminium electrolytic capacitor at the input, the value doesn't matter, use something you already have on your BOM, but it should have enough ESR to damp the LC ringing.

Anyway, if you fail EMC it will most likely be about common mode noise, and this will not do anything about that. Common mode noise is handled by having a good placement on the board, a good layout, proper grounding etc.

If you had extreme EMC headaches in the past, you can hire a specialist consultant for a few hours so they may look at your board, this would most likely be cheaper than going into the test chamber and failing.