Basically the difference between Spider Rigging & Pushing is speed (& amount of weight used). When I'm Pushing jigs, I have a 1oz trolling weight on & I go around 1mph ... when Spider Rigging, most people I know have 1/2oz-3/4oz weights on & go less than 0.5mph ... and live bait is often used when Spider Rigging, but not when Pushing.
My setup is two Hi-Tek rod holders ... two 14ft rods in each / two rods on each side of the bow ... line counter reels with 30lb braid or 20lb mono ... a duo-lock clip on the tag end of the main line, then a weight attached to the clip, a duo-lock clip on the other end of the weight, then my leader line's loop knot attached to that clip and my jig tied on the end of the leader. I have a couple of sections of Pool Noodles with pre-made leader lines & jig heads so I can change out leaders when necessary. My leader lines are 6lb test mono & around 18inches long. When I'm fairly familiar with the areas I'm Pushing in, I have been known to add a rod or two to the mix ... usually shorter rods (7-10ft rods).
That's just how I do it .... others may have a different setup.