Just use 3 terminal capacitors. Crazy low inductance, no rules of thumb needed. https://www.kyocera-avx.com/docs/techinfo/CeramicCapacitors/decoupling-principl

Just use 3 terminal capacitors. Crazy low inductance, no rules of thumb needed. https://www.kyocera-avx.com/docs/techinfo/CeramicCapacitors/decoupling-principle-and-low-inductance-mlcc.pdf https://www.kyocera-avx.com/docs/techinfo/CeramicCapacitors/... by Kyocera AVX https://product.tdk.com/en/techlibrary/solutionguide/3tf03.html https://product.tdk.com/en/techlibrary/solutionguide/3tf03.h... by TDK tl;dr: ESL is dominated by packaging inductance so the geometry of the capacitor matters a lot more than the value 3 terminal capacitors are the cheapest "low inductance" capacitor that have a meaningfully better ESL. If you need better than that you should use an EM field solver to properly understand PDN impedance.