What do you base the Libre statistics on?
If you only see problems on the first day, why not apply the sensor the day (or two) before activating?
Don't trust the internet reports - few people comment when things work as expected, they only comment when it doesn't.
I have been using Libre for a couple of years, always apply mine at least 2 days before activation and my failure rate is much lower than one in three - probably around one in 30 (I think I have been using it for two years and had to replace 3 due to faults).
I have also tried Dexcom G6 when they had a free trial. For me, it was no more accurate than Libre with calibration (I use xDrip as it allows calibration with finger pricks) so not worth the cost, especially as I am very lucky to get Libre on prescription but would have to self fund Dexcom.
There are other CGMs - I know Medtronic have one, so do Medtrum, and I am sure Google will tell you more.