Apply Template to several entities

I have a bunch of entities, measurement type, Sensor; all having a couple of decimal places, e.g. 123.987. I want to keep that precision, however, in my dashboard, I want to see only the integer-part, e.g. 123.

So, changing the display precision in UI is not what I want, as this changes the displayed precision throughout HA. Besides: I to not want rounding to be applied but really just get only the integer-part (e.g. “floor()”), e.g. I want 123 and not 124.

I created a template: {{ states('sensor.<my_sensor_name>') | round(0, "floor", default) }}

My question: is there a clever way to just save this template and “apply” it to several entities? Or do I have to create separate template sensors for every single entity where I want this “conversion”. I the latter: does this also affect database storage, i.e. is additional space occupied by the template sensors?

Thanks

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