It's been around 25 years years or so, but: I found 'TI Shield', made by Texas Instruments, on page 14 of Michael Percy's catalog. It's still in his catalog*, though out of production for decades.
Placed a full coverage sheet on each component's shelf and on the top (under the granite, to shield the turntable), of my system's cabinet.
Haven't looked back since.
Just seemed/seems to me that the most immediate threat of interference, would be the EMI/RFI created by the components themselves.