What to do with the money? US market

I have an amount of $650k that I won't be using at first.
Starting from now, our total income before taxes is expected to be approximately $350k.
What are your recommendations for safe investments at the moment?
I'm thinking of taking a risk of no more than 10% of the amount. We are planning to have a $1.2m loan for the purchase of a house within the next two years.
I'm in the US and know almost nothing about investing here.
Thank you in advance