You're going to want to put them closer to the sun. Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1) https:

You're going to want to put them closer to the sun. Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1) https://www.pnas.org/content/103/46/17184 https://www.pnas.org/content/103/46/17184 https://en.m.wikipedia.org/wiki/Space_sunshade https://en.m.wikipedia.org/wiki/Space_sunshade