What to use depends on what the soil needs and the only way to find that ouit is with a good, reliable soil test. Contact you local office of your state universities USDA Cooperative Extension Service to find out about having that done.
What is the level of organic matter in that soil?
How well does that soil drain?
How workable is that soil?
What does that soil smell like?
How much life is in that soil?
The answers to these questions will help make that soil in a good, healthy soil that will grow strong, healthy plants. An organic gardener thinks more about the soil than simply adding "fertilizers".

Sure, they will work. Unless your soils are base to alkaline, the chelated iron may be unnecessary (most perennials do not have high iron requirements) and you could be missing some important trace elements by using these amendments alone. More importantly, you may be just making extra work for yourself. In 20 years, I've never fertilized perennials with anything more than a periodic mulch of compost - it will improve soil structure, provide a full range of primary and secondary nutrients (albeit in low concentrations) and add necessary organic matter, thus stimulating soil biology. Few soils and plants are not benefitted by the routine addition of compost.