Peckish

If possible site the feeders over a concrete pad or paving slab which can easily be swept clean. Clean underneath the feeders every day taking care to avoid leaving any food around overnight. If rodents are climbing up your feeding table of feed station install a baffle to prevent them climbing the pole. Alternatively take in the feeders overnight and store in a rodent proof container, not plastic as rats can easily chew through, ideally use a metal container. Store the spare feed in a metal container with a tight lid which can't be opened by rodents, rats are smarter than you think.

Birds are very wary of being ambushed by predators so site your feeders where they have good vision all around. They also need somewhere to shelter if they are threatened by predators so a nearby thick bush where they can hide would be beneficial.

Yes the better quality brands have carried out research on the optimum mix for providing the birds with seeds and grains which they will eat and not spit onto the ground. Better quality blends also don't use grains which germinate all over the garden.

Store somewhere dry and frost free in metal bins. If you have a problem with rodents a metal bin with a snug fitting lid is essential as they will chew through plastic and are smart enough to knock off a lid.