Questions about prospective habitat suitability

For reference, I'm in the East Midlands of the UK.

So I'm hoping to get my own pet tort later this year- an eastern Hermann's if I can given their relative ease of care. Having looked around for breeders, I found this place called The Tortoise Den that seem quite reputable from what I can gather.

In particular, I've been interested in the housing bundles they sell; for example, this one:

https://www.tortoise-den.co.uk/tortoise-packages/hermann-tortoise-large-package

Now on the surface this bundle seems to provide everything that a young hermann's may need like UV, heat, decent substrate... but I have one major concern, and that's humidity. I'm well aware that Hermann's need a pretty high amount of humidity for proper shell growth, and my original plan was to house them in a vivarium, rather than a table, during their younger years so as to make certain that it's sufficiently provided.

So I figured I'd ask you, kind subreddit:

1) Have you had any experience with The Tortoise Den? Are they reputable sellers?

2) Is it possible to meet a young Hermann's humidity needs with only a table of this variety, or am I better served going with my original plan of a vivarium?

Thanks in advance for any help you can give.