Middle of this page should answer your questions:  https://library.vuforia.com/content/vuforia-library/en/articles/Solution/Targets.html

It is not platform dependent as far as I know.

Hello,

We recommend that you do not exceed tracking ten (10) simultaneous 2D targets, and two (2) simultaneously tracked Object Targets. Vuforia Model Targets current imposes a maximum of one (1) target that can be tracked at a time.

These settings are not platform dependent, but they can be device dependent when considering the device specs. There's no Vuforia Engine API that monitors the device's performance, but we tend to watch CPU, GPU and/or capture frame rate as evidence that a device's performance is suffering.

Here are the Vuforia APIs to control these settings:

• 2D targets: https://library.vuforia.com/content/vuforia-library/en/reference/unity/classVuforia_1_1VuforiaConfiguration_1_1GenericVuforiaConfiguration.html#a4166fb9b79e7268dd7d19ad2b34e0044
• 3D targets: https://library.vuforia.com/content/vuforia-library/en/reference/unity/classVuforia_1_1VuforiaConfiguration_1_1GenericVuforiaConfiguration.html#a2241ba507325067bc726d83c8563e04c

Thanks,

Vuforia Engine Support

Thank you for answer my question.