How To fasten rubberwood desktop to electric motorized steel base, in easy detach/ knock-down way using Fasteners? e.g. Wood inserts?

I'm designing & putting together a workstation desk with the following traits:

* Electric motorized (lift capacity: 120 kg) & heavy Steel frame base (30kg)
	+ Its a knock-down design put together using hex key-driven M6 M8 & few M10 bolts
* Rubberwood desk/ tabletop

**So for consistency with the above & need for easy disassembly, I'd prefer to use similar metric bolts**.

Hence, I'm considering attaching the top with metric bolts from the bottom, *through the pass through layers of a steel base and a rubber cushion spacer + washer* (**Total: ~11mm**), into matching threaded inserts.

* Upon reading online the insert types I found are these and am told that top left thread-in types for hardwood would be suitable.
* *Commenters/ responders here have posted there are special types of other better Fasteners. I'd like to know, review them for additional "holding power" and related benefits they bring.*

[![4 types ](https://i.stack.imgur.com/pcY3R.jpg)](https://i.stack.imgur.com/pcY3R.jpg)

The rubberwood top is **18mm** thick & pass through non-wood layers (**~11mm**). I do not know the final dimensions of the top, but assume a rectangle roughly 1m wide and under 2m long. *[The OP is free to update these dimensions as necessary --jdv]*  

*(OP: Size subject to change but within above & hence need insert for detachability)*

My main questions are about the fasteners/ inserts.

* **What is the safe maximum depth the inserts can be made into the rubberwood?** Will this material hold inserts at all?
* **Which insert style is recommended in this application?**
	+ ***What special type of fasteners supersede wood inserts I've mentioned so far***?

Follow-on question: **Does the size of the bolt (M6, M8, M10, etc.) and matching insert matter for this application?**

### Update Follow-up to this Question:

Noticed a lot of variety of combinations even in threaded inserts of the hardwood type: [*Self tapping (advise by jdv), Slotted, 3 holes/ blind holes, collar, Hex, Reservoir, etc.
(Pic from some German site)*](https://i.imgur.com/IYZtNj3.png)

(Image is big so linked, but can be inserted if SE folks ok - Or should these slot/ holes/ etc meta parameters go to a new Q?)

**What pros cons of these in my scenario and what's recommended or to avoid? Why bother asking all this?**

Scouted a dozen mom & pop hardware shops I went to did not have any.(Nothing like Home Depot).

I do see some of the above variety on [local business yellow pages listing site](https://www.indiamart.com), so they do exist & have to be found, but they don't respond to me/ consumers.

I'll eventually run into and find some variants, just not sure which ones - hence, I need to know the "yes, okay, maybe, avoid, no way" of some of the common types.

### High Res measurement pics:

All the layers I want to sandwich together:
[![Image 2](https://i.stack.imgur.com/vpSLw.jpg)](https://i.stack.imgur.com/vpSLw.jpg)

The metal and rubber layers:
[![Image 1](https://i.stack.imgur.com/zKB1z.jpg)](https://i.stack.imgur.com/zKB1z.jpg)

Width of the rubber washer:
[![Image 3](https://i.stack.imgur.com/ZHEXA.jpg)](https://i.stack.imgur.com/ZHEXA.jpg)