Recommendation for Wiressles 4G Router that DO NOT have Channel Avoidance Mechanism

Hi,

Good day to you.

I would like to ask, any Wireless 4G router model to recommend?

Requirement as follows:
1) First, it must be able to manual set the wireless channel number, instead of 'Auto' assigned.

2) Secoundly, the router DO NOT enforce "Channel Avoidance Mechanism
(ie: It just use whatever Channel number that I've manually set, and WILL NOT automatically change it to another Channel number when it detect that this Channel number is used by some other wireless network around)

Reason for the above requirement is due to I have very bad experience with TP-LINK router (model: Archer MR200), where it has this "Channel Avoidance Mechanism" feature.

In the web-console, it allows me to manually set a Channel number.

But whenever it detect that this Channel number is used by some other network around, it will somehow still automatically set to another Channel number.

This behaviour causes my wireless client device connection to drop as the Channel number out of its accepted range.

Appreciate if you can recommend a router model that do not have this issue?

Thanks.