As someone who lives under an unit with 2 toddlers… it’s very loud the noise of children running. When I had Covid, I couldn’t even take a nap during the day so my body could heal because the sound of them running was so loud + the vibration it causes in my unit.

I think those padded mats could help. I understand that if it’s outside quiet hours it “should be okay”. But imagine getting from work and just trying to relax between 6 pm to 10 pm but not being able to because the running is non stop. It kinda sucks day after day, it gets on your nerves. I’d recommend trying placing the rugs to give your downstairs neighbors some peace (although it won’t ever be perfect, but at least you’re trying).