You need to cut the plant, carry it and fill the silo in one day. Make more small silos not one big silo. You must compact the silage to remove air. The silo must be strong enough for this. Seal the top of the silo to keep air out, replace the seal quickly after removing silage.
Silage produces a lot of effluent.
Make drains on each side of the silo floor to remove waste. Fill the drains with stones and rocks. Make sure the drains do not go near drinking water. If your silo is large, make a base for unloading equipment. Choose a site with good drainage and firm soil base.