Hot glue OK in hot climate?

Soon I'll be installing my tweeters in the a-pillars and know that I'll need to use some type of adhesive to hold them in. I was planning in using hot glue. But, after reading up on it a bit, I'm not so sure it's the best idea since I live in Texas and I've read that the glue can soften in the heat. Feedback online ranges from "I've been doing this for 20 years and never had a problem" to "I've seen it happen a million times".  I'd love to hear some real world experience from y'all. I've read that I can use silicon instead, but that involves a much longer dry time.