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I bought an one that attaches to the source line to the faucet, but I'm nervous to install it for risk of leaks.

Teflon tape is your friend when plumbing things together.

Definitely. I'm more worried about the valve in the pedal being faulty and leaking.

Not always. It only works with FIP/MIP connections. If it's a compression fitting you're just wasting money.

Compression fittings first question is "can you use a shark bite push fit instead?"

Second thing is, get a small amount of food safe grease and put it on the copper ferrule to make the connection: took me far too long to learn that.