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No don't apply fertiliser before top soil is put down. I would use organic fertiliser just prior to planting and again when planting.
I would also incorporate compost or bagged dried manure too mixed into the top soil
There will be many saying any fertiliser will do, that they are all the same chemically. Organic fertilisers are slightly more costly but they contribute to the soil, are more gentle and produce sturdier plants. Artificial usually produce lanky quick growth with little resistance to disease, pest etc. Organic every time
If you haven't got a soil testing kit, just take a quick look around the gardens in your immediate area to see what is growing there.
If you spot hydrangeas, rhododendrons, and pieris your soil will be acid. The rhododendrons and pieris are evergreens in the main so you will be able to spot them even in Winter. If you are not sure what they look like, Google them and click on images. x