Laravel Nova select the same value several times

Hello. I use this package: https://github.com/ziffmedia/nova-select-plus

I need select the same values several times. How I can do it? I have a field:

SelectPlus::make(__('Products'), 'products', \App\Nova\Product::class)->rules('required')
        ->hideFromIndex(),

I tried use ->maxSelections(999), but it not working. Please help resolve this issue.