"make suggestions to" is grammatically correct and is often used in written English.
Example: I will make suggestions to the company on how to improve their sales strategies.
Please feel free to make suggestions to the class.
As the demos came in, Davis would play them and make suggestions to Latona.
The great ones make suggestions to help you realise your work more fully.
Its centerpiece was ten public forums in which residents were invited to make suggestions to improve the schools.
How might they use the information they gathered to make suggestions to community leaders or policy makers?
Hanging around shoots, he would make suggestions to photographers about how they could change their angles or correct their colors.
Viacom's president, Mel Karmazin, was quick to point out that the company would only make suggestions to its creative units.
The main thrust of the article is not to criticise Marina Picasso or to make suggestions to her.
My Chinese employees don't see it as their job to have ideas or make suggestions to their leaders.
Opower, a data-analytics firm, crunches figures on size, occupancy, location and energy bills to find trends and make suggestions to 50m, mostly American, households.
So Catwalk Genius has just introduced "community features" that allow investors to make suggestions to designers — but it is up to the designers to accept them or not.
