Is it OK then to have a ‘shree yantra’ in the home?

You may use it with responsibility. It is NOT, we repeat, NOT to be given to anybody who is not aware of its powers and does not take the responsibility of using it correctly. This is not a request. IT IS AN ORDER! Damage of severe form will occur to those who play with it. There are many who are enticed by its power and energy; they feel it; it is seducing! They will damage only themselves! They may even cause
fire and destruction of a physical nature in the areas surrounding them.
IS THAT UNDERSTOOD?!  IT IS NOT TO BE USED AS A WHIM! However, for those into whose keeping it comes, as long as they internally AFFIRM that they are going to use it sparingly and with conscious god-given choice, they and ONLY THEY may be permitted to harness its energies. For those who do not do this, the danger will be severe. We caution you and request you to speak to others who may not be here today.