The absoulte best "ferrite" suppressor that i have seen is the type thats solld in most DIY and home centers , They come in 4, 8,16 and there may even be a 24l pound model . They all come with a long wood handle attached ,and you apply them liberally to any switch mode power supply in sight"

. The "suppresson" from these is excellent 200 db + and its one size fits all.
Your probably not going to do that. But i did , it works. I changed as many SMPSs to regulated/non regulated(class 2) as possible.
The best non destructive suppression is going to be to use shielded cables where ever possible the tighter the braid the better. I think you'll get 70-90 db depending on the braid , get clear cables for indoor that way you can tell its shielded.
Ferrites : 43 material fo 10 Mhz and up . 31 material 10 Mhz and down . You can use either one for general wideband HF suppression . 28 material will also work .
Generally speaking the bigger the ferrite the more suppression. Use large dia clip ons and multiple turns for max suppression. FT 240 cores for lots of turns or big connectors that cant be removed. Remember nomenclature is Diameter - material ,,,an FT 240 - 43 core => 2.4 inch diameter 43 material.
If cost is factor you can simply coil up the offending cable like a coax balun and get some suppression that way.
For cable TV make sure its Quad shielded RG6.
One of the best things to do is to bury any exposed cables , the soil tends to suppess RF.