Syfer (now Knowe) X2Y EMI filter
Filters are not trivial or simple with mutual coupling , unknown source impedances, complex loads and variable Q resonance and anti resonance.

Your schematic is already a 9th order LPF and non of the ESL are included.

The 10nF part you selected has an SRF of 100MHz and that is due to the ESL of about 1nH due to its small size. But if you add 0.5nH/mm traces that will lower the SRF and possibly react with all the other reactances.  Good or bad all depends what emissions you have and need to control.



This is not a solution but demonstrates a lossy ferrite bead and cap with a SRF and a lower PRF anti-resonant peak.  You must get s parameters &amp; simulate or characterize your approved vendors and test with suitable test methods on your layout or experiment with other modelling tools such as Falstad's or using a scope with impulse testing using AC couple 50 ohm semi-rigid coax terminated at DSO with 50R.



For example here was a perfectly flat group delay Bessel filter destroyed by mismatching the load R.