Hi.  Alu spreader plates will work A-OK, used them a load of times in clients houses. Just make sure you have the joist detail done at 400mm centres not 600mm!!! Using an electric or air staple gun is my preferred method of installing the plates, and it’s important to make sure the butt up to each other and do not overlap. That will allow you to get them fixed down snug and be squeak free. If possible, you are best off keeping the underside of the finished floor exposed so you can go