FaceTime without an iPhone

Yes, it will work.

I did sent my in-laws an iPad Pro 12.9" from Australia to Germany and we FaceTime every week using Wi-Fi.

it should prove not significant problem facetiming without owning an iphone but an ipad or ipod touch

Use FaceTime with your iPhone, iPad, or iPod touch - Apple Support

Where you use the iPad doesn’t necessarily determine the availability of the FaceTime App; it is where the iPad is purchased that is the key to this restriction.

If purchasing within Europe, you should have any issues with using FaceTime.

The issue of FaceTime generally comes about with travellers who find some good duty-free prices when travelling through many Arab States - only to later find that FaceTime functionality is permanently denied on their “bargain” devices. Likewise, buyers accepting that use of FaceTime is prohibited within some countries, are equally surprised that FaceTime remains unavailable after exporting to other regions.

I hope this clarification adequately resolves any remaining concern.

If purchasing a device explicitly for FaceTime calls - and are purchasing the device abroad - be mindful that devices sold in some countries (in particular, many Middle East countries) do not permit installation and use of FaceTime.

Due to legal restrictions in these countries/regions, the iPad inhibits FaceTime. Exporting from the country of purchase does not remove the “burnt-in” restriction. If purchasing from US or European authorised retailers, the iPad will have access to all major functions - including FaceTime. If purchasing elsewhere, exercise due diligence.

I hope this additional information and forewarning is helpful to you.