An option I found works very well is to put the whole rack on Townshend Seismic Corners. The effect is substantial, and similar to isolating each component with 4 pods. Having done this then subsequently isolating individual components makes no difference. So the cost saving is potentially substantial.
Prior to having done this I found the Townshend pods much better than the Isoacoustic Orea on components. To be honest the latter made no difference to the sound. The Gaia feet on the speakers on the other hand were transformative.