GPS Tracker for bikes/scooters

Hi everyone. Recently I had my e-bike stolen from my work place's parking lot and it was recently bought for 2 months. 3 years ago it happened the same and I had a small gps tracker installed on it, but the thieves noticed it, so it was useless.
Can anyone recommend my a good device that can not be noticed, please?

 

I know that there is a company that sells some bike trackers which can be hidden under the bike's seat

 

Unfortunately, this is not up to me..

 

And do you think that this is an better option? Can it be tracked by the thieves?

 

it should be a better option I think. this is how it looks like:

 

Yes, looks good. Do you have this tracker? And where can I buy it from?

 

I do not have it yet, but I was thinking about buying it when I will have a new bike. their website is in the video's description if I remember right

 

I also have the same case.