Wall mounted electric fire - hard to install? Recommedations

Bit of a backstory, purchased a new build, brochure stated all homes to have a wall mounted electric fire, it turns out to be a mistake in the brochure & the builders are not backtracking. Their compromise is that they are going to give us a 300 euro voucher to purchase our own, they said the plans have been drawn up & signed off so they will not install it...
I have no idea where the voucher will be for but I like the look of them & hopefully hubby may be able to install, if anyone has any iota about them can you let me know, I also like the look of the electric stoves but am unsure how practical they would be with small children & the wall mounted ones obviously take up less space...